A three-electric system for coal mine vehicles

Abstract

The present invention relates to the technical field of coal mine vehicles, and discloses a three-electric system for coal mine vehicles. The system comprises a battery power supply unit, a load unit and a BMS management unit. The battery power supply unit has a power supply network with multiple battery groups and single cells as independent power supply nodes to maintain power supply balance. The power supply network is used to configure a corresponding charging circuit and a discharging circuit for each power supply node, and is communicated and connected with the BMS management unit through the unique coding address of the control switch of the charging circuit and the discharging circuit, so that the BMS management unit selects a power supply node that meets the charging and discharging conditions from the power supply network to perform charging and discharging operations. By designing multiple independent power supply nodes and making them supply power to the load unit and the BMS management unit according to the discharging rules and charge in an orderly manner according to the charging rules, the power supply balance of the battery power supply unit can be maintained, and the overcharging and over-discharging of the previous battery during use can be avoided, thereby improving the service life of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine vehicles, in particular to a three-electric system for coal mine vehicles. Background Art

[0002] Mining vehicles are mainly used in open-pit mines, large hydropower stations, infrastructure construction sites, and the transportation of ore materials. With the rapid development of electric vehicles, battery vehicles are gradually being introduced into mine construction operations, but mining battery vehicles have the following defects: the existing explosion-proof vehicle control system is mainly controlled according to the operating characteristics of the explosion-proof diesel engine, and it cannot accurately control the battery charging and discharging operation mode, resulting in overcharging or over-discharging of the battery, which greatly affects the battery life. When the battery fails during operation, it is easy to cause safety accidents. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a three-electric system for coal mine vehicles to solve the technical problems mentioned in the prior art.

[0004] A three-electric system for a coal mine vehicle, the system comprising:

[0005] The battery power supply unit has a power supply network with multiple battery groups and single cells as independent power supply nodes to maintain power supply balance, the power supply network is used to configure a corresponding charging circuit and a discharging circuit for each of the power supply nodes, and is communicated and connected with the BMS management unit through the unique coding address of the control switch of the charging circuit and the discharging circuit, so that the BMS management unit selects the power supply node that meets the charging and discharging conditions from the power supply network to perform charging and discharging operations, wherein;

[0006] Each of the power supply nodes is connected to the electrical output end of the charging interface module through a corresponding charging circuit and is charged according to a preset charging rule;

[0007] Each of the power supply nodes is connected to the power input terminal of the load unit and the BMS management unit through a corresponding discharge circuit and discharges according to a preset discharge rule;

[0008] The BMS management unit has:

[0009] A signal acquisition subunit, configured to construct a collector with a tree structure according to the positional relationship of the plurality of power supply nodes involved in the power supply network and the association relationship between the power supply nodes, wherein the tree structure of the collector constructs corresponding acquisition nodes, and collects the voltage signal or current signal of the corresponding power supply node through the voltage / current sensor of each acquisition node and converts the voltage signal or current signal into a digital signal through an AD converter;

[0010] A battery management model building subunit is connected to the signal acquisition subunit, and the battery management model building subunit builds a battery management model based on the battery parameters of the battery pack and the single battery, and receives the digital signal sent by the signal acquisition subunit in real time and uploads it to the battery management model to update the power consumption status of the battery pack and the single battery in the battery management model;

[0011] a control subunit, connected to the battery power unit, the charging interface module, the load unit and the battery management model building subunit;

[0012] In the charging stage, the control subunit controls the charging interface module to select charging to the battery pack and / or the single battery according to the power consumption status of the battery pack and the single battery in the battery management model, and stops charging when the remaining battery power of each power supply node reaches the pre-discharge amount;

[0013] During the discharge stage, when the control subunit receives the power request information from the load unit, it generates a power supply instruction and sends it to the battery power supply unit to control the power supply network to select any group of the power supply nodes that meet the discharge conditions to power the load unit through the corresponding discharge circuit until the battery remaining capacity of all the power supply nodes is lower than the pre-charge capacity and the discharge is stopped.

[0014] Optionally, the battery management model uses a display of the battery management model construction subunit as a carrier to display the remaining battery capacity, battery charge and discharge voltage / current progress bar and battery operation mode of the power supply node.

[0015] Optionally, the battery operation mode includes a charging mode, a discharging mode and a standby mode, and the power supply node is in any one of the modes when the system is started.

[0016] Optionally, the charging rule includes:

[0017] When the remaining battery capacity of at least one of the single cells is greater than the pre-discharge capacity to maintain system operation, the power supply network connects the charging circuits of all the power supply nodes in the standby mode and whose remaining battery capacity is less than the pre-charge capacity to the charging interface module in order from the smallest to the largest remaining battery capacity for charging, and terminates the charging mode when the remaining battery capacity of all the power supply nodes in the standby mode reaches the pre-discharge capacity;

[0018] When the remaining battery capacity of all the power supply nodes is less than the pre-discharge capacity and is insufficient to maintain the system operation, the power supply network connects the corresponding charging circuits of the power supply nodes in the standby mode to the charging interface module in the charging sequence from single battery to battery pack for charging, and the charging logic of the single battery and the battery pack is:

[0019] The charging interface modules are connected in order from small to large battery remaining capacity for charging.

[0020] Optionally, the discharge rule includes:

[0021] The power supply network retrieves any one of the battery groups whose remaining battery capacity is greater than the pre-discharge capacity from the multiple battery groups and supplies power to the load unit through the corresponding discharge circuit, and retrieves any one of the single battery groups whose remaining battery capacity is greater than the pre-discharge capacity from the multiple single battery groups and supplies power to the BMS management unit through the corresponding discharge circuit.

[0022] Optionally, the pre-discharge amount of the power supply node is set to 70%-100% of the corresponding battery capacity;

[0023] The pre-charge amount of the power supply node is set to 30%-40% of the corresponding battery capacity.

[0024] Optionally, when the remaining battery capacity of any one of the power supply nodes in the battery management model is lower than the pre-charge capacity, the battery management model forms a first feedback instruction and uploads it to the control subunit, the control subunit controls the power supply node to charge according to the charging rule and obtains the discharge rate of the corresponding power supply node in two adjacent discharge cycles to calculate the battery loss of the corresponding power supply node, and couples the calculated battery loss of the power supply node to the battery management model to update the battery discharge voltage / current progress bar display progress of the corresponding power supply node, wherein;

[0025] The battery loss of the power supply node = the discharge rate of the previous discharge cycle - the discharge rate of the current discharge cycle;

[0026] The discharge rate of the power supply node in each discharge cycle is the total battery power consumption of the corresponding discharge cycle divided by the discharge duration.

[0027] Optionally, when the remaining battery capacity of all the battery packs in the battery management model is lower than the pre-charge capacity, the battery management model forms a second feedback instruction and uploads it to the control subunit, and the control subunit connects the load unit to the single cell through an auxiliary circuit and controls the battery pack to stop discharging and be in standby mode, until the remaining battery capacity of all the single cells in the battery management model is lower than the pre-charge capacity, then the battery management model forms a third feedback instruction and uploads it to the control subunit to control the battery pack and the single cell to be in standby mode.

[0028] Optionally, the charging interface module has a DC / DC conversion interface, a first contactor and a second contactor, the input end of the DC / DC conversion interface is connected to a DC power supply unit, the output end of the DC / DC conversion interface is connected to the normally closed contacts of the first contactor and the second contactor, the normally open contact of the first contactor is connected to the charging circuit of the battery pack, the normally open contact of the second contactor is connected to the charging circuit of the single cell, and the control coils of the first contactor and the second contactor are respectively connected to the control subunit.

[0029] Optionally, the load unit includes at least an explosion-proof motor, a lighting system, a voice broadcast system and a signal light;

[0030] The signal acquisition subunit also has a speed sensor, which is installed on one side of the transmission gear of the explosion-proof motor. A reflective film is provided at the edge of the transmission gear of the explosion-proof motor. The speed sensor is used to collect the transmission gear speed signal of the explosion-proof motor and convert it into a digital signal through the AD converter and send it to the control subunit. The control subunit adjusts the speed of the explosion-proof motor according to the transmission gear speed signal of the explosion-proof motor to control the battery power consumption of the power supply node during the discharge cycle.

[0031] The beneficial effects that the present invention can produce include:

[0032] A three-electric system for coal mine vehicles provided by the present invention comprises a battery power supply unit, a load unit and a BMS management unit. By designing a plurality of independent power supply nodes and making them independently power the load unit and the BMS management unit according to the discharge rules, and orderly charging according to the charging rules, the power supply balance of the battery power supply unit can be maintained, and the overcharging and over-discharging of the battery during use in the past can be avoided, thereby improving the service life of the battery and avoiding safety accidents caused by failure of the battery power supply unit of the system during the operation stage of the load unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1This is a schematic diagram of the circuit connection of a three-electric system for a coal mine vehicle according to the present invention;

[0034] Figure 2 The present invention is a logic block diagram of a BMS management unit of a three-electric system for a coal mine vehicle. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1 and Figure 2As shown, the present invention provides a three-electric system for coal mine vehicles, the system includes a battery power supply unit, a load unit and a BMS management unit, the battery power supply unit has a power supply network with multiple battery groups and single cells as independent power supply nodes to maintain power supply balance, wherein the battery group is formed by connecting multiple parallel / series battery individuals and is arranged outside the flameproof cavity, and the single cell is an independent battery individual arranged in the flameproof cavity; the power supply network is used to configure a corresponding charging circuit and a discharging circuit for each power supply node, and communicate with the BMS management unit through the unique coding address of the control switch of the charging circuit and the discharging circuit, so that the BMS management unit selects a power supply node that meets the charging and discharging conditions from the power supply network for charging and discharging operations; each power supply node is connected to the electrical output end of the charging interface module through the corresponding charging circuit and is charged according to a preset charging rule, and each power supply node is connected to the load unit and the electrical input end of the BMS management unit through the corresponding discharging circuit and is discharged according to a preset discharging rule; the BMS management unit has a signal acquisition subunit, a battery management model construction subunit and a control subunit, and the signal acquisition subunit is used to construct a tree structure according to the position relationship of multiple power supply nodes involved in the power supply network and the association relationship between the power supply nodes. The collector of the structure is constructed, and the tree structure of the collector constructs the corresponding collection nodes, and the voltage signal or current signal of the corresponding power supply node is collected through the voltage / current sensor of each collection node, and converted into a digital signal through the AD converter; the battery management model construction subunit is connected to the signal collection subunit, and the battery management model construction subunit establishes a battery management model based on the battery parameters of the battery pack and the single cell, and receives the digital signal sent by the signal collection subunit in real time and uploads it to the battery management model to update the power consumption status of the battery pack and the single cell in the battery management model; the control subunit is connected to the battery power unit, the charging interface module, and the load unit The Yuanhe battery management model constructs a sub-unit. In the charging stage, the control sub-unit controls the charging interface module to select charging to the battery pack and / or single battery according to the power consumption status of the battery pack and single battery in the battery management model, and stops charging when the battery remaining capacity of each power supply node reaches the pre-discharge capacity; in the discharging stage, the control sub-unit generates a power supply instruction when receiving the power consumption request information of the load unit and sends it to the battery power supply unit to control the power supply network to select any group of power supply nodes that meet the discharge conditions to supply power to the load unit through the corresponding discharge circuit, and stops discharging when the battery remaining capacity of all power supply nodes is lower than the pre-charge capacity.

[0037] In this embodiment, when the system is started, the BMS management unit is powered by the single battery, and the load unit is powered by the battery pack. Specifically, the remaining battery capacity of the battery pack and the single cell is detected by the voltage sensor respectively and uploaded to the battery management model to display the power consumption status of the battery power supply unit, so as to facilitate the operator to judge whether the remaining battery capacity of the battery power supply unit can be maintained until the end of the construction work of the construction stage; if it can, the system is started and the power supply node is controlled to discharge according to the discharge rule to supply power to the load unit and enter the operation mode; if it cannot, the power supply node is controlled to connect to the charging interface module for charging according to the charging rule; during the charging process, the control subunit controls the charging interface module to select to charge the battery pack and / or the single cell according to the power consumption status of the battery pack and the single cell in the battery management model, and at the same time, the voltage / current signal of the charging circuit is detected by the voltage / current sensor to judge whether the remaining battery capacity of the corresponding battery pack or the single cell reaches the pre-discharge amount; when the remaining battery capacity of any one of the battery packs or the single cell reaches the pre-discharge amount, the control subunit controls the corresponding charging circuit to be disconnected until the remaining battery capacity of the battery pack and the single cell reaches the pre-discharge amount and the system ends the charging state. The present invention designs multiple independent power supply nodes and enables them to independently power the load unit and the BMS management unit according to the discharge rules, and orderly charge according to the charging rules, so as to maintain the power supply balance of the battery power supply unit, avoid overcharging and over-discharging of the battery during use, thereby improving the service life of the battery and avoiding safety accidents caused by malfunction of the battery power supply unit of the system during the operation stage of the load unit.

[0038] Furthermore, the battery parameters include battery capacity and battery charge and discharge voltage / current values. The battery management model uses the display of the battery management model construction subunit as a carrier to display the battery remaining capacity, battery charge and discharge voltage / current progress bar and battery operation mode of the power supply node. Specifically, the battery operation mode includes charging mode, discharging mode and standby mode, and the power supply node is in any of these modes when the system starts. In the above, the charging rules of the power supply network include: when the battery remaining capacity of at least one single cell is greater than the pre-discharge capacity to maintain the operation of the system, the power supply network will be in standby mode and the battery remaining capacity is less than the pre-charge capacity of the charging circuit of all power supply nodes in the order of battery remaining capacity from small to large to connect to the charging interface module for charging in order, until the battery remaining capacity of all power supply nodes in the standby mode reaches the pre-discharge capacity to end the charging mode; when the battery remaining capacity of all power supply nodes is less than the pre-discharge capacity and is insufficient to maintain the operation of the system, the power supply network will be in standby mode. The power supply node connects the corresponding charging circuit to the charging interface module in the order from single cell to battery group for charging, and the charging logic of the single cell and battery group is: in the order of battery remaining capacity from small to large, connect to the charging interface module for charging in order. The discharge rules include: the power supply network calls any battery group from multiple battery groups whose battery remaining capacity is greater than the pre-discharge capacity and supplies power to the load unit through the corresponding discharge circuit, and calls any single cell from multiple single cells whose battery remaining capacity is greater than the pre-discharge capacity and supplies power to the BMS management unit through the corresponding discharge circuit. Among them, the pre-discharge amount of the power supply node is set to 70%-100% of the corresponding battery capacity; the pre-charge amount of the power supply node is set to 30%-40% of the corresponding battery capacity.

[0039] In the above, the battery management model construction subunit performs big data simulation training according to the battery capacity of the battery pack and the single cell, and the battery charge and discharge voltage / current value to generate a battery management model, and forms the battery remaining capacity of the battery pack and the single cell, the battery charge and discharge voltage / current progress bar and the battery operation mode in the battery management model and displays them on the display interface of the display, so that the signal acquisition subunit uploads the collected digital signal to the battery management model in real time, so that the operator can manage the normal operation of the system according to the battery remaining capacity of the battery pack and the single cell, the battery charge and discharge voltage / current progress bar and the battery operation mode displayed on the display.

[0040] Furthermore, when the remaining battery capacity of any power supply node in the battery management model is lower than the pre-charge capacity, the battery management model forms a first feedback instruction and uploads it to the control subunit. The control subunit controls the power supply node to charge according to the charging rule and obtains the discharge rate of the corresponding power supply node in two adjacent discharge cycles to calculate the battery loss of the corresponding power supply node, and couples the calculated battery loss of the power supply node to the battery management model to update the battery discharge voltage / current progress bar display progress of the corresponding power supply node, wherein; the battery loss of the power supply node = the discharge rate of the previous discharge cycle - the discharge rate of the current discharge cycle; the discharge rate of the power supply node in each discharge cycle is the total battery power consumption of the corresponding discharge cycle divided by the discharge duration.

[0041] As an embodiment of the present invention, each power supply node can be set as a lithium-ion battery. During use, the data in the battery management model can be iteratively updated according to the discharge rate of each power supply node. For example, when it is detected that the voltage value of the discharge circuit of the battery pack is constant in the same two detection cycles in different time periods, and the battery consumption of the battery pack increases, it means that the battery pack has been damaged. At this time, the discharge rate of the current battery pack is obtained and divided by the preset discharge rate of the battery pack in the battery management model to obtain the battery loss coefficient of the battery pack, and the calculated battery loss coefficient of the battery pack is coupled to the discharge rate of the battery pack in the battery management model to generate the current discharge rate of the battery pack. Similarly, the discharge rate of the single cell in the battery management model is updated according to the above-mentioned iterative update method to update the rise / fall speed of the battery charge and discharge voltage / current progress bar in the battery management model.

[0042] Furthermore, when the remaining battery capacity of all battery packs in the battery management model is lower than the pre-charge capacity, the battery management model generates a second feedback instruction and uploads it to the control subunit. The control subunit connects the load unit to the single cell through the auxiliary circuit and controls the battery pack to stop discharging and be in standby mode. Until the remaining battery capacity of all single cells in the battery management model is lower than the pre-charge capacity, the battery management model generates a third feedback instruction and uploads it to the control subunit to control the battery pack and the single cell to be in standby mode.

[0043] In this embodiment, when the remaining battery capacity of any power supply node in the battery management model is less than 30%, the battery management model forms a first feedback instruction and uploads it to the control subunit, and the control subunit controls the power supply node to charge according to the charging rule; when the remaining battery capacity of all battery packs in the battery management model is less than 10%, the battery management model forms a second feedback instruction and uploads it to the control subunit, so that the control subunit connects the load unit to the single cell through the auxiliary circuit and controls the battery pack to stop discharging and be in standby mode, until the remaining battery capacity of all single cells in the battery management model is less than 10%, the battery management model forms a third feedback instruction and uploads it to the control subunit to control the battery pack and the single cell to be in standby mode.

[0044] Furthermore, the charging interface module has a DC / DC conversion interface, a first contactor and a second contactor. The input end of the DC / DC conversion interface is connected to a DC power supply unit, which is configured as a DC charging pile in this embodiment. The output end of the DC / DC conversion interface is connected to the normally closed contacts of the first contactor and the second contactor. The normally open contact of the first contactor is connected to the charging circuit of the battery pack, and the normally open contact of the second contactor is connected to the charging circuit of the single cell. The control coils of the first contactor and the second contactor are respectively connected to the control subunit, so that the control subunit connects the charging circuit of the battery pack or the charging circuit of the single cell by controlling the closure of the control coils of the first contactor and the second contactor, thereby realizing selective charging of the charging interface module.

[0045] Further, the load unit at least includes an explosion-proof motor, a lighting system, a voice broadcast system and a signal light. In the above, the signal acquisition subunit also has a speed sensor, which is installed on one side of the transmission gear of the explosion-proof motor. A reflective film is arranged at the edge of the transmission gear of the explosion-proof motor. When the transmission gear of the explosion-proof motor rotates one circle, the optical fiber transmission reflection of the speed sensor generates an electric pulse signal once, and then the transmission gear speed signal of the explosion-proof motor is calculated according to the number of pulses detected, so that the speed sensor converts the collected transmission gear speed signal of the explosion-proof motor into a digital signal through an AD converter and sends it to the control subunit. The control subunit adjusts the speed of the explosion-proof motor according to the transmission gear speed signal of the explosion-proof motor to control the battery power consumption of the power supply node during the discharge cycle. Specifically, the signal acquisition subunit is connected to the control subunit through a CAN bus communication. The signal acquisition subunit generates a corresponding message from the digital signal according to the data frame format of the CAN bus and sends it to the control subunit through the CAN bus, so that the operator can control the speed of the explosion-proof motor through the control subunit to control the battery power consumption of the power supply node during the discharge cycle.

[0046] In the above, a programmable self-test program is embedded in the control subunit. When the system starts, the control subunit receives the message sent by the signal acquisition subunit and stores it in the register and starts the programmable self-test program to analyze, calculate and process the detection signal received by the signal acquisition subunit, so as to obtain the actual operation data of the system and generate corresponding messages according to the data frame format of the CAN bus and feed them back to the control subunit. The programmable self-test program has a self-test strategy, which includes: initializing the operation parameters of the system and obtaining the charge and discharge level variation amplitude curve of the battery power unit and the operation parameters of the load unit, wherein the voltage signal or current signal of the corresponding power supply node collected by the voltage / current sensor of each acquisition node of the signal acquisition subunit during the detection cycle is converted into a digital signal through an AD converter, and the charge and discharge level variation amplitude curve of the battery power unit is generated with the digital signal. Specifically, the self-check strategy is to trigger self-check of each acquisition node through a set operating mechanism; wherein the set operating mechanism may be that when the charge and discharge level change amplitude curve of each acquisition node detected by the signal acquisition subunit in the previous detection cycle exceeds the detection threshold, the self-check strategy is triggered to perform self-check on the corresponding acquisition node to detect whether the battery power supply unit is operating normally.

[0047] In the above, the BMS management unit also has a data processing subunit, which is connected to the control subunit, the battery power unit and the load unit, and is used to receive the charge and discharge level change amplitude curve of the battery power unit and the operating parameters of the load unit obtained by the programmable self-test program and determine whether they exceed the set threshold; if the set threshold is exceeded, a fault command is generated to control the system to shut down and an alarm message is issued through the voice broadcast system. At this time, the operator cannot operate the system through the control subunit to achieve forced shutdown of the system; if the set threshold is not exceeded, an operation command is generated to control the system to start, and the operator can operate the system through the control subunit.

Claims

1. A three-electric system for coal mine vehicles, characterized in that: The system comprises: The battery power supply unit has a power supply network with multiple battery groups and single cells as independent power supply nodes to maintain power supply balance, the power supply network is used to configure a corresponding charging circuit and a discharging circuit for each of the power supply nodes, and is communicated and connected with the BMS management unit through the unique coding address of the control switch of the charging circuit and the discharging circuit, so that the BMS management unit selects the power supply node that meets the charging and discharging conditions from the power supply network to perform charging and discharging operations, wherein; Each of the power supply nodes is connected to the electrical output end of the charging interface module through a corresponding charging circuit and is charged according to a preset charging rule; Each of the power supply nodes is connected to the electrical input terminal of the load unit and the BMS management unit through a corresponding discharge circuit and discharges according to a preset discharge rule, wherein the discharge rule includes: The power supply network selects any one of the battery groups whose remaining battery capacity is greater than the pre-discharge capacity from the multiple battery groups and supplies power to the load unit through the corresponding discharge circuit, and selects any one of the single battery groups whose remaining battery capacity is greater than the pre-discharge capacity from the multiple single battery groups and supplies power to the BMS management unit through the corresponding discharge circuit; The BMS management unit has: A signal acquisition subunit, configured to construct a collector with a tree structure according to the positional relationship of the plurality of power supply nodes involved in the power supply network and the association relationship between the power supply nodes, wherein the tree structure of the collector constructs corresponding acquisition nodes, and collects the voltage signal or current signal of the corresponding power supply node through the voltage / current sensor of each acquisition node and converts the voltage signal or current signal into a digital signal through an AD converter; A battery management model building subunit is connected to the signal acquisition subunit, and the battery management model building subunit builds a battery management model based on the battery parameters of the battery pack and the single battery, and receives the digital signal sent by the signal acquisition subunit in real time and uploads it to the battery management model to update the power consumption status of the battery pack and the single battery in the battery management model; a control subunit, connected to the battery power unit, the charging interface module, the load unit and the battery management model building subunit; In the charging stage, the control subunit controls the charging interface module to select charging to the battery pack and / or the single battery according to the power consumption status of the battery pack and the single battery in the battery management model, and stops charging when the remaining battery power of each power supply node reaches the pre-discharge amount; During the discharge stage, when the control subunit receives the power request information from the load unit, it generates a power supply instruction and sends it to the battery power supply unit to control the power supply network to select any group of the power supply nodes that meet the discharge conditions to power the load unit through the corresponding discharge circuit until the battery remaining capacity of all the power supply nodes is lower than the pre-charge capacity and the discharge is stopped.

2. A three-electric system for coal mine vehicles according to claim 1, characterized in that: The battery management model uses the display of the battery management model construction subunit as a carrier to display the battery remaining capacity, battery charging and discharging voltage / current progress bar and battery operation mode of the power supply node.

3. A three-electric system for coal mine vehicles according to claim 2, characterized in that: The battery operation mode includes a charging mode, a discharging mode and a standby mode, and the power supply node is in any one of the modes when the system is started.

4. A three-electric system for coal mine vehicles according to claim 3, characterized in that: The charging rules include: When the remaining battery capacity of at least one of the single cells is greater than the pre-discharge capacity to maintain system operation, the power supply network connects the charging circuits of all the power supply nodes in the standby mode and whose remaining battery capacity is less than the pre-charge capacity to the charging interface module in order from the smallest to the largest remaining battery capacity for charging, and terminates the charging mode when the remaining battery capacity of all the power supply nodes in the standby mode reaches the pre-discharge capacity; When the remaining battery capacity of all the power supply nodes is less than the pre-discharge capacity and is insufficient to maintain the system operation, the power supply network connects the corresponding charging circuits of the power supply nodes in the standby mode to the charging interface module in the charging sequence from single battery to battery pack for charging, and the charging logic of the single battery and the battery pack is: The charging interface modules are connected in order from small to large battery remaining capacity for charging.

5. The three-electric system for coal mine vehicles according to claim 2, characterized in that: The pre-discharge amount of the power supply node is set to 70%-100% of the corresponding battery capacity; The pre-charge amount of the power supply node is set to 30%-40% of the corresponding battery capacity.

6. A three-electric system for coal mine vehicles according to claim 5, characterized in that: When the remaining battery capacity of any one of the power supply nodes in the battery management model is lower than the pre-charge capacity, the battery management model forms a first feedback instruction and uploads it to the control subunit, the control subunit controls the power supply node to charge according to the charging rule and obtains the discharge rate of the corresponding power supply node in two adjacent discharge cycles to calculate the battery loss of the corresponding power supply node, and couples the calculated battery loss of the power supply node to the battery management model to update the battery discharge voltage / current progress bar display progress of the corresponding power supply node, wherein; The battery loss of the power supply node = the discharge rate of the previous discharge cycle - the discharge rate of the current discharge cycle; The discharge rate of the power supply node in each discharge cycle is the total battery power consumption of the corresponding discharge cycle divided by the discharge duration.

7. A three-electric system for coal mine vehicles according to claim 6, characterized in that: When the remaining battery capacity of all the battery packs in the battery management model is lower than the pre-charge capacity, the battery management model forms a second feedback instruction and uploads it to the control subunit. The control subunit connects the load unit to the single cell through an auxiliary circuit and controls the battery pack to stop discharging and be in standby mode. Until the remaining battery capacity of all the single cells in the battery management model is lower than the pre-charge capacity, the battery management model forms a third feedback instruction and uploads it to the control subunit to control the battery pack and the single cell to be in standby mode.

8. The three-electric system for coal mine vehicles according to claim 1, characterized in that: The charging interface module has a DC / DC conversion interface, a first contactor and a second contactor. The input end of the DC / DC conversion interface is connected to a DC power supply unit, the output end of the DC / DC conversion interface is connected to the normally closed contacts of the first contactor and the second contactor, the normally open contact of the first contactor is connected to the charging circuit of the battery pack, the normally open contact of the second contactor is connected to the charging circuit of the single cell, and the control coils of the first contactor and the second contactor are respectively connected to the control subunit.

9. The three-electric system for coal mine vehicles according to claim 1, characterized in that: The load unit at least includes an explosion-proof motor, a lighting system, a voice broadcast system and a signal light; The signal acquisition subunit also has a speed sensor, which is installed on one side of the transmission gear of the explosion-proof motor. A reflective film is provided at the edge of the transmission gear of the explosion-proof motor. The speed sensor is used to collect the transmission gear speed signal of the explosion-proof motor and convert it into a digital signal through the AD converter and send it to the control subunit. The control subunit adjusts the speed of the explosion-proof motor according to the transmission gear speed signal of the explosion-proof motor to control the battery power consumption of the power supply node during the discharge cycle.

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